signal from ecu to coolant level sen., st205, maybe it will do better to post it here Options

[urbandork]

ok so my st205 water pump is hooked up just as it is on the edw except since i didnt have a relay for it so i just ran the wires around the would be relay.

im drawing my power from the cds fuse just like it shows on the ewd and the ground is also ran just like it is on the ewd.

the other three wires from the pump hook up to the corisponing wires on the ea1 connector which feed back into the ecu just like it is on the ewd

the level sensor has been tested and found that it does
close and complete the cuircut

i checked continuity between the ecu and sensor plug and fount that im not getting a signal from the ecu to the sensor......

........ anyone know what kinda signal is sent out from the ecu to the sensor which goes from the sensor (if closed) and to the ground.

[phattyduck]

If you are free, just give me a call and find a time to come over to my house this weekend... We should be able to figure it out together with the diagrams and a multimeter. I should be around my house Saturday afternoon through Sunday.

-Charlie

[urbandork]

If you are free, just give me a call and find a time to come over to my house this weekend... We should be able to figure it out together with the diagrams and a multimeter. I should be around my house Saturday afternoon through Sunday.

-Charlie

ill give u a call

thanks man

this safe mode is really killing me...

[scothaniel]

Not sure if you've already figured this out or not...

ok so my st205 water pump is hooked up just as it is on the edw except since i didnt have a relay for it so i just ran the wires around the would be relay.

What ECU are you using? If your using the 205 ECU, you MUST have the pump relay installed otherwise you can damage the ECU.

checked continuity between the ecu and sensor plug and fount that im not getting a signal from the ecu to the sensor......

Sounds like a wiring issue. If you dont have continuity between the LEV wire at the ECU and ground, then somethings not connecting.

anyone know what kinda signal is sent out from the ecu to the sensor which goes from the sensor (if closed) and to the ground.

Think of the coolant level sensor as an on-off switch. There is no signal from the ECU, its just checking for a ground to complete the circuit (like the switch is in the on position). If the coolant level drops, the switch turns off and the circuit breaks. You can just jumper the ECU to ground and bypass the sensor altogther as a temp fix.

[urbandork]

Not sure if you've already figured this out or not...

ok so my st205 water pump is hooked up just as it is on the edw except since i didnt have a relay for it so i just ran the wires around the would be relay.

What ECU are you using? If your using the 205 ECU, you MUST have the pump relay installed otherwise you can damage the ECU.

checked continuity between the ecu and sensor plug and fount that im not getting a signal from the ecu to the sensor......

Sounds like a wiring issue. If you dont have continuity between the LEV wire at the ECU and ground, then somethings not connecting.

anyone know what kinda signal is sent out from the ecu to the sensor which goes from the sensor (if closed) and to the ground.

Think of the coolant level sensor as an on-off switch. There is no signal from the ECU, its just checking for a ground to complete the circuit (like the switch is in the on position). If the coolant level drops, the switch turns off and the circuit breaks. You can just jumper the ECU to ground and bypass the sensor altogther as a temp fix.

how do i rewire around the relay so i dont damage the ecu???????

what exactly happens because ive been driving around with it like that since ive had it

oh and i had the hole clip so yes im using an st205 relay.

omg i didnt get the relay cus the company said it must have gotten stolen. blah this is one big head ach

why does the ecu get damage from the lack of a relay????? what happens exacly???

damn im soo worried now.

[lagos]

read this on how relays work
http://electronics.howstuffworks.com/relay.htm

you cant power something like an intercooler pump off of your ecu. it needs more power then the ecu was designed to handle, so youll just end up frying something. you want the pump to get its power right from the battery (with a fuse in line), and hook up the other part of the relay to the ecu, so that the ecu can trigger it on/off as it needs to.

This post has been edited by lagos: Dec 5, 2006 - 5:24 PM

[urbandork]

read this on how relays work
http://electronics.howstuffworks.com/relay.htm

you cant power something like an intercooler pump off of your ecu. it needs more power then the ecu was designed to handle, so youll just end up frying something. you want the pump to get its power right from the battery (with a fuse in line), and hook up the other part of the relay to the ecu, so that the ecu can trigger it on/off as it needs to.

but i am drawing power from a 12v source with a fuse in line. Im running power from the exact same fuse as it was on the st205, which is the cds 30a fuse which draws its power from the bat after going through the key switch.

what should i do?

i have it wired up so that when the car starts it looks like the relay is always closed (pump is always on) Isnt this how its supose to be even when the relay is in line???? this is how it appears on the ewd. cus once the key is turned it supplies constant power to the relay before getting fed back into the ecu.

the ewd shows the power going to the magnet being drawn from the 7.5a IGN fuse which is on all the time when ur driving. thus keeping the relay always closed when the car is running. after it exits the relay it goes into the ecu.

the ewd shows that after the relay is closed power coming from the CDS 30a fuse goes into the relay switch and then to the pump and powers it.

then the ground wire goes back to a ground and the three other wires which the ecu uses to monitor the pump goes back to the ecu jsut as it shows on the ewd.

[scothaniel]

Just wire the pump in place of the bulb. Any relay will do, I'm using a standard Bosch relay.


The bosch relays only draw .16 amps of power, placing a very small load on the ECU. Wiring the pump directly means that the ECU is getting the full amperage that the pump is pulling (around 4 amps I believe).

[scothaniel]

also, the ecu regulates the pump, its not on all of the time. It'll probably throw a code if its sensing voltage when the pump is supposed to be off.

[urbandork]

ok so i think im in deep dudu

tonite i got a the relay off of my old 5sfe's efi relay.

i wired it up and found that
one i still got the cel
and two that with a test light i found that before the relay there was power. however power would only go completely through the magnet side of the relay if i grounded the other side of the relay. with it connected to the ecu it would not complete the curcuit.

I think that by running the magnet wire back into the ecu with out the relay being there i fubar'ed something up in the ecu.

what should i do? is there a way to fix the ecu? or do i need another one?

[phattyduck]

OMG.... you have to come over tomorrow night.

It should be easy enough to fake everything (and I have an extra relay, I think).

-Charlie

[urbandork]

OMG.... you have to come over tomorrow night.

It should be easy enough to fake everything (and I have an extra relay, I think).

-Charlie

lol ok cool ill come over tmw evening ill give u a call around 2 or 3 after my final and leave a mesg.

[WannabeGT4]

i have it wired up so that when the car starts it looks like the relay is always closed (pump is always on)

the ewd shows the power going to the magnet being drawn from the 7.5a IGN fuse which is on all the time when ur driving. thus keeping the relay always closed when the car is running. after it exits the relay it goes into the ecu.

the ewd shows that after the relay is closed power coming from the CDS 30a fuse goes into the relay switch and then to the pump and powers it.

The relay should be triggered by the INT pin of the ECU.

When the ECU switches INT to ground it completes the relay's trigger circuit. This is the only time the pump should be running.

also, the ecu regulates the pump, its not on all of the time. It'll probably throw a code if its sensing voltage when the pump is supposed to be off.

Absolutely correct. It WILL throw a code if it is constantly running.

[urbandork]

ohhhhhhhh

would i have harmed the ecu by

one having the pump on all the time

two by having the wire from the 7.5 ign fuse wire connected to the int ecu wire all the time with no relay inbetween.

This post has been edited by urbandork: Dec 6, 2006 - 12:43 PM

[WannabeGT4]

ohhhhhhhh

would i have harmed the ecu by

one having the pump on all the time

two by having the wire from the 7.5 ign fuse wire connected to the int ecu wire all the time with no relay inbetween.

Having the pump running all the time won't hurt it but I'm not so sure about INT. Only one way to find out. Hook it up right and see.

This post has been edited by WannabeGT4: Dec 6, 2006 - 2:53 PM

[urbandork]

ohhhhhhhh

would i have harmed the ecu by

one having the pump on all the time

two by having the wire from the 7.5 ign fuse wire connected to the int ecu wire all the time with no relay inbetween.

Having the pump running all the time won't hurt it but I'm not so sure about INT. Only one way to find out. Hook it up right and see.

its hooked up the right way now using a relay from my old 5sfe. and the light still comes on. and ive bypassed the level sensor too.

im guna stop by charles and c whats up

[phattyduck]

im guna stop by charles and c whats up

Well, it turns out it was a few different problems...

The ECU was fried - both the Intercooler Pump pin and the Fuel Pump relay pin... He's currently using my ECU (luckily it was the same P/N). I'll be fixing his so he can use it again.

AND it was an incorrect relay - normally closed instead of normally open. (he didn't get the correct on with his clip)

All is fixed and the car is nice and fast.

-Charlie

PS. Craig, I could hear you until you got to the freeway. Your car sounds pretty good.

[urbandork]

im guna stop by charles and c whats up

Well, it turns out it was a few different problems...

The ECU was fried - both the Intercooler Pump pin and the Fuel Pump relay pin... He's currently using my ECU (luckily it was the same P/N). I'll be fixing his so he can use it again.

AND it was an incorrect relay - normally closed instead of normally open. (he didn't get the correct on with his clip)

All is fixed and the car is nice and fast.

-Charlie

PS. Craig, I could hear you until you got to the freeway. Your car sounds pretty good.

Charlie u r da MAN.

thanks for everything ill give a call tmw. Ima take u out to eat for sure.

[phattyduck]

Charlie u r da MAN.

thanks for everything ill give a call tmw. Ima take u out to eat for sure.

Thanks.

I tried to fix your ECU, but I won't be able to without another good ECU. Along with the two burned resistors, there were to burned transistors on the back of the board. The best plan would probably be for you to just give me the other ECU that is on its way to you from England. They are all the same P/N, so it should all work out.

-Charlie

[urbandork]

Charlie u r da MAN.

thanks for everything ill give a call tmw. Ima take u out to eat for sure.

Thanks.

I tried to fix your ECU, but I won't be able to without another good ECU. Along with the two burned resistors, there were to burned transistors on the back of the board. The best plan would probably be for you to just give me the other ECU that is on its way to you from England. They are all the same P/N, so it should all work out.

-Charlie

lol i might have voided that ebay bid but ill c if i can get him to keep me buying it